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Power Current Sense Resistors
Vishay Foil Resistors
Z-Based Bulk Metal(R) Foil Technology Rapid R Stabilization - Low WCR - Low TCR
VHP4Z VFP4Z VCS331Z
VPR247Z
VCS332Z
Product may not be to scale
Rapid R stabilization under transient loads, low wattage coefficient (WCR), and low temperature coefficient (TCR) are features of this new Z Based Bulk Metal(R) Foil series of Current Sense Resistors. The series should be selected where rapid .R stabilization and resistance stability under transient power conditions is required. These products achieve optimum performance when mounted on a chassis or cooled heat sink. The Z Based Technology provides extremely low WCR under defined conditions (see Figure 1 and Figure 2). The low absolute TCR provided by the Z Based Technology is measured over the temperature range of - 55 C to + 125 C, + 25 C reference (see Figure 3). All of these devices utilizing the Z Based Technology are provided with a true 4 terminal Kelvin connection. This is a must for current sensing when the R-value is less than 100 . The VHP4Z and VPR247Z types add the additional benefit of hermeticity. The welded construction and nitrogen backfill provide maximum protection against environmental stresses and insures long term stability. Typical applications for this new series includes electron beam circuitry, electron microscopes, fire control radar display systems, high speed video display, deflection amplifier circuits, constant current power supplies and forced balance electronic scales. Custom high power designs can be developed for your specific applications.
SALES
FEATURES
* Rapid R Stabilization under transient loads (see Figure 1) * Tenfold improvement of Wattage Coefficient of Resistance (WCR): 4 ppm/W (see Figure 2) * Low Temperature Coefficient of Resistance: (see Figure 3 and Table 2) * Thermal Resistance: 6 C/W * Power Rating: 10 watts on heat sink1) at + 25 C (see Table 2) 3 watts in free air at + 25 C (see Table 2) * Load Life Stability: 0.05 % Max R, 10 W on heat sink at + 25 C, 2000 hours 0.01 % Max R, 3 W on heat sink at + 25 C, 2000 hours 0.05 % Max R, 3 W in free air at + 25 C, 2000 hours * Current Noise: < 0.01 V(RMS)/volt of applied voltage * Thermal EMF: 0.1 V/C maximum, 0.05 V/C typical * Non-Inductive design
NOTE: 1.Heatsink - Aluminum (6" L x 4" W x 2" H x 0.04" THK)
* ASIA/JAPAN: foilsales.asia@vishay.com * UK/HOLLAND/SCANDINAVIA: foilsales.eunorth@vishay.com * AMERICAS: foilsales.usa@vishay.com * GERMANY/CZECH REPUBLIC/AUSTRIA: foilsales.eucentral@vishay.com * FRANCE/SWITZERLAND/SOUTHERN EUROPE: foilsales.eusouth@vishay.com * ISRAEL: foilsales.israel@vishay.com
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For technical questions, contact: foil@vishay.com
Document Number: 63086 Revision: 02-Mar-05
Power Current Sense Resistors
Z-Based Bulk Metal(R) Foil Technology Vishay Foil Resistors Rapid R Stabilization - Low WCR - Low TCR
FIGURE 1 - RAPID STABILIZATION
RESISTANCE DEVIATION, ppm
FIGURE 2 - POWER COEFFICIENT (WCR)
RESISTANCE DEVIATION, ppm
60 40 20 0 - 20 - 40 - 60 0 1 2 5 APPLIED POWER IN WATTS RESISTANCE CHANGE VS APPLIED POWER MOUNTED ON COOLED HEAT SINK HELD AT + 25 C 8 10
15 10 5 0 -5 - 10 - 15 0 20 40 60 80 100 120 140 160 180 200 TIME IN SECONDS RESISTANCE CHANGE UNDER LOAD AT 10 WATTS MOUNTED ON COOLED HEAT SINK HELD AT + 25 C
FIGURE 3 - TEMPERATURE COEFFICIENT RESISTANCE
RESISTANCE CHANGE, ppm
250 200 150 100 50 0 - 50 - 100 - 150 - 200 - 250 - 55
FIGURE 4 - POWER DERATING CURVE
-2
m/
C
2p +8
PERCENT OF RATED POWER
pp
m m/ pp
/ C
C
+ 200
+ 100 + 75 + 50 + 25 0
- 55 C
+ 25 C
+2
p
/ pm
C
-2
pp
m/
C
+ 125
- 200
- 50
0
+ 50
+ 100
+ 150
+ 200
AMBIENT TEMPERATURE
+ 25
AMBIENT TEMPERATURE (C) NO LOAD APPLIED
FIGURE 5 - KELVIN CONNECTION
r1 I1 E1 r3 Im 0
R E2 r4
r2 I2
r5
Kelvin, 4-terminal, connections are utilized for these low ohmic value products to measure a precise voltage drop across the resistive element. In these applications the contact resistance, lead resistance, and their TCR effect may be greater than that of the element itself and could cause significant errors if the standard 2-terminal connection is used. Figure 5 shows a high impedance measurement system where r5 approaches infinity and Im approaches zero resulting in negligible IR drop through r3 and r4 which negates their lead resistance and TCR effect. With the voltage sense leads E1 and E2 inside of r1 and r2 the resistance and TCR effect of the current leads, I1 and I2 are negated and only the resistance and TCR of the element R are sensed. This method of measurement is essential for precise current sensing.
8
SALES * ASIA/JAPAN: foilsales.asia@vishay.com * UK/HOLLAND/SCANDINAVIA: foilsales.eunorth@vishay.com * AMERICAS: foilsales.usa@vishay.com * GERMANY/CZECH REPUBLIC/AUSTRIA: foilsales.eucentral@vishay.com * FRANCE/SWITZERLAND/SOUTHERN EUROPE: foilsales.eusouth@vishay.com * ISRAEL: foilsales.israel@vishay.com
Document Number: 63086 Revision: 02-Mar-05
For technical questions, contact: foil@vishay.com
www.vishay.com 2
Power Current Sense Resistors
Vishay Foil Resistors
Z-Based Bulk Metal(R) Foil Technology Rapid R Stabilization - Low WCR - Low TCR
FIGURE 6 - STANDARD IMPRINTING AND DIMENSIONS
VHP4Z
Mounting Hole
0.665 (16.89) 0.005 ( 0.13) 1.186 (30.13) 0.005 ( 0.13) 1.530 (38.86) 0.005 ( 0.13) 0.266 (6.76) 0.005 ( 0.13) 0.335 (8.51) 0.005 ( 0.13)
Standard Marking Arrangement
VISHAY
Model No. VHP-3Z Res. Val. 21K500 Res. Tol. 0.01 % Date Code 9802 Ex: 98 02 Year Week I1 E1 E2 I2
0.770 (19.56) max dia I2 TO-3 cap TO-3 base 0.040 (1.00) dia 0.005 ( 0.13) 0.43 (10.92) 0.01 ( 0.25) 1.00 (25.4) 0.005 ( 0.13)
0.222 (5.64) E1
E2
0.156 dia (3.9) 0.005 ( 0.13)
VPR247Z
0.120 0.005 (3.05 0.13) 0.690 0.005 (17.53 0.13) 0.040 0.005 (1.02 0.13) 0.140 0.005 (3.56 0.13)
(Dia. Thru Hole)
0.45 (11.43) min.
I1
VFP4Z
0.125 0.005 (5.46 0.13)
1.575 0.016 (40 0.4) 1.181 0.016 (30 0.4) 0.197 (5) 0.276 - 0.008 (7.0 - 0.2 ) 0.118 (3)
+ 0.004 + 0.1
0.820 0.005 (20.83 0.13) 0.010 (0.254) max Sleeve Extension
VISHAY VPR247Z XXXX 0R2000 1 %
Date Code 10 01 Year Week Tolerance 0.500 Min (12.70)
VISHAY VFP-4Z (Value) (Tol.) (Date Code)
0.150 0.004 (3.8 0.1) 0.394 0.008 (10 0.2) Lead Dia. 0.025 (0.633) Solder Coated Copper 0.787 0.016 (20 0.4)
Resistance Value IEEI 0.200 0.005 1 1 2 2 (5.08 0.13) S 0.100 0.005 (2.54 0.13) LS
Gold Plated Copper Leads 0.025 Dia (0.633)
1.00 Min. (25.4 Min.)
0.120 0.005 (3.05 0.13)
I1 E1 E2
I2
0.200 [x3] (5.08)
VCS331Z
0.138 (3.5) NOMINAL 1.340 0.008 (34.0 0.2) 0.701 0.008 (17.8 0.2) 0.087 (2.2) MAXIMUM 0.210 (5.33) MAXIMUM
VCS332Z
1.340 0.008 (34.0 0.2) 0.701 0.008 (17.8 0.2) 0.138 (3.5) NOMINAL 0.087 (2.2) MAXIMUM 0.210 (5.33) MAXIMUM
0.197 0.008 (5.0 0.2)
1.063 (27.0) MAXIMUM
VISHAY VCS331Z 0R2000 1 % B9825
0.16 (0.4) NOMINAL
1.024 (26.0) MAXIMUM
VISHAY VCS332Z 8R2000 0.1 % B9825
0.032 (0.8) NOMINAL
0.197 0.008 (5.0 0.2)
0.040 (1.0) NOMINAL
0.040 (1.0) NOMINAL
0.216 (5.5) MINIMUM
0.040 (1.0) NOMINAL
0.689 0.020 (17.5 0.5) 1.083 0.20 (27.5 0.5)
0.689 0.020 (17.5 0.5) 1.083 0.20 (27.5 0.5)
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For technical questions, contact: foil@vishay.com
Document Number: 63086 Revision: 02-Mar-05
1.00 (25.4) MINIMUM
Power Current Sense Resistors
Z-Based Bulk Metal(R) Foil Technology Vishay Foil Resistors Rapid R Stabilization - Low WCR - Low TCR
TABLE 1 - RESISTANCE VALUE VS TOLERANCE
RESISTANCE RANGE () 10 to 500 5 to < 10 2 to < 5 1 to < 2 0.5 to < 1 0.25 to < 0.5 STANDARD TOLERANCE (%) 0.01 % 0.02 % 0.05 % 0.10 % 0.25 % 0.50 %
TABLE 2 - SPECIFICATIONS
TEST OR CONDITION Wattage Coefficient of Resistance (WCR) Temperature Coefficient of Resistance (TCR) (- 55 C to + 125 C, + 25 C Reference) Thermal Resistance Maximum Ambient Temperature Rated Power Zero Power Power Rating at + 25 C VHP4Z VPR247Z VFP4Z VCS331Z VCS332Z Load Life Stability + 25 C + 150 C 10 Watts or 3 Amps Maximum (Heat Sink)2), 3) 3 Watts or 3 Amps Maximum (Free Air)3) 10 Watts or 5 Amps Maximum (Heat Sink)2),3) 3 Watts or 5 Amps Maximum (Free Air)3) 0.05 % Max R, 10 W on heat sink at + 25 C, 2000 hours 0.01 % Max R, 3 W on heat sink at + 25 C, 2000 hours 0.05 % Max R, 3 W in free air at + 25 C, 2000 hours 0.1 H Maximum; 0.08 H Typical < 0.1 ppm/V < 0.010 V(RMS)/Volt of applied voltage (- 40 dB) PERFORMANCE 4 ppm/Watt Maximum1) 1.0 to 500 , 2 ppm/C Maximum 0R25 to < 1.0 , 3 ppm/C Maximum 6 C/Watt1)
Inductance Voltage Coefficient Current Noise NOTES: 1. Mounted on a cooled heat sink held at + 25C 2. Heatsink - Aluminum (6" L x 4" W x 2" H x 0.04" THK) 3. Whichever is lower
TABLE 3 - ORDERING INFORMATION
Please specify Vishay VHP4Z, VPR247Z, VFP4Z, VCS331Z, VCS332Z series resistors as follows: MODEL NO. VHP4Z RESISTANCE RANGE 0.25 to < 500 RESISTANCE VALUE LETTER DESIGNATOR R Example: 100R01 = 100.01 Resistance Value, in , is expressed by a series of 6 characters, 5 of which represent significant digits while the 6th is a dual purpose letter that designates both the multiplier and the location of the comma or decimal. MULTIPLIER FACTOR x1 TOLERANCE 0.01 %
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Document Number: 63086 Revision: 02-Mar-05
For technical questions, contact: foil@vishay.com
www.vishay.com 4
Legal Disclaimer Notice
Vishay
Disclaimer
All product specifications and data are subject to change without notice. Vishay Intertechnology, Inc., its affiliates, agents, and employees, and all persons acting on its or their behalf (collectively, "Vishay"), disclaim any and all liability for any errors, inaccuracies or incompleteness contained herein or in any other disclosure relating to any product. Vishay disclaims any and all liability arising out of the use or application of any product described herein or of any information provided herein to the maximum extent permitted by law. The product specifications do not expand or otherwise modify Vishay's terms and conditions of purchase, including but not limited to the warranty expressed therein, which apply to these products. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document or by any conduct of Vishay. The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications unless otherwise expressly indicated. Customers using or selling Vishay products not expressly indicated for use in such applications do so entirely at their own risk and agree to fully indemnify Vishay for any damages arising or resulting from such use or sale. Please contact authorized Vishay personnel to obtain written terms and conditions regarding products designed for such applications. Product names and markings noted herein may be trademarks of their respective owners.
Document Number: 91000 Revision: 18-Jul-08
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